#user_name_label:after{
    content:"*";
    color:red;
    position: absolute;
    top:12px;
    left:35px;
}

#passwd_label:after{
    content:"*";
    color:red;
    position:absolute;
    top:12px;
    left:50px;
}

#passwd_again_label:after{
    content:"*";
    color:red;
    position:absolute;
    top:12px;
    left:20px;
}